iDA-X305 and Hard Drive

Hey guys.. I've searched for this but haven't found anything yet, so here goes..

I just got an ida-x305 and I'm thinking about getting a hard drive for it (looking at a WD 250GB My Passport, USB powered). iPhone and flash drives work fine on it now, but I've been questioning the power and heat issue with a hard drive. I'd like to know if anyone has tried this, and whether there is enough power to run an actual drive.